Learn Python Easy Way - Part 3

We will look at the sequential data types in Python. They are Strings, Lists and Tuples. You can access a single character in a string by its index.

For Example

Saying = "A Friend in need in a Friend indeed"
print(Saying[0], Saying[3], Saying[4],Saying[7])
A r i d

Thus you can access any character from a string by mentioning it's index number. The index numbers are counted from 0 onward. This Saying[0] indicates the character in the string in the 0th position. Whereas you can also use negative numbering for indexes. Thus -1 indicated the last character in a string. And -2 will be the second character from the end and so on.


List in Python is a ordered sequence, it may contain any of the allowed elements in Python. Thus a List may include strings, numbers, special characters, mathematical statements etc.

stateCapitals = ["Mumbai", "Delhi", "Calcutta", "Hyderabad","Bengluru"]
print("Capital of Maharashtra is "+ stateCapitals[0])
Capital of Maharashtra is Mumbai

print("The Fourth number in the list is" , myNumbers[3])
A list can be empty, A list can consists of names, numbers, or mixed. A list can be nested. 

You can append an item to a list or insert an item at a location in a list or remove an item from a location in a list.

Let us look at examples of working with elements in a list. 

print("The capital of Gujarat used to be", stateCapitals[5])
 The capital of Gujarat used to be Ahmedabad

print("However, the present capital of Gujarat is ", stateCapitals[5])
 However, the present capital of Gujarat is  Gandhinagar

mylist = ["Maharashtra",["Mumbai","Pune","Nagpur"]]
print("These are some of the important cities in ", mylist[0]," - ", mylist[1][0], mylist[1][1], mylist[1][2])
  These are some of the important cities in  Maharashtra  -  Mumbai Pune Nagpur

One more interesting built in method/function in lists is to count the number of occurrences of an element in the given list. Let us look at an example

mylist = ["potato", "banana", "orange", "banana", "pomegranate","banana"]
print(  "The term banana has appeared ", count.mylist("banana"), " Times in this list")
  The term banana has appeared  3  Times in this list

You can slice the elements in a list.

myList = [9, 7, 34, 67, 81, 40, 25]
[7, 34, 67, 81]

This will print the list starting from the number at location 1 till the 5th (excluding 5th that is). Remember that the counting of elements in a list begins from 0.

So lists are a versatile Data type in Python that can allow you to do many interesting things that we will see in further articles. 

Popular posts from this blog

Introduction to Scratch Programming for ICSE Class 5

Hour of Code - Frozen with Anna and Elsa

Programming for kids - Course 4 # Artist for loops